Does Mojang occasionally invalidate all sessions, making it so everyone has to restart Minecraft?
I've been playing Minecraft for a few years. I know if you log in with another instance of Minecraft, your session will be invalidated. However, when joining a new server after a few hours, I will occasionally have to restart Minecraft after being kicked for the "Invalid Session: Try restarting your game" without actually having logged in on a separate instance.
It's happened a couple times in the last few months, but nothing else suspicious is going on.
42 Answers
Invalid Session happens when another instance of Minecraft is launched with the same login, it detects that there are two Minecraft instances running on the same username, and wants you to revalidate it to make sure its YOU. This also happens if you change your IP or change your VPN during gameplay
If a new session, or your current session is interrupted, you will have to re-authenticate with the login server
